Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.geomorph.2007.06.008 |
Late Holocene upper bounds of flood magnitudes and twentieth century large floods in the ungauged, hyperarid alluvial Nahal Arava, Israel | |
Jacoby, Yael2; Grodek, Tamir2; Enzel, Yehouda1; Porat, Naomi3; McDonald, Eric V.4; Dahan, Ofer5 | |
通讯作者 | Enzel, Yehouda |
来源期刊 | GEOMORPHOLOGY |
ISSN | 0169-555X |
出版年 | 2008 |
卷号 | 95期号:3-4页码:274-294 |
英文摘要 | The impact of large twentieth century floods on the riparian vegetation and channel morphology of the relatively wide anabranching and braided Nahal Arava, southern Israel, was documented as part of developing tools to (a) identify recent large floods, (b) determine these flood’s respective magnitudes in alluvial ungauged streams, and (c) determine long-term upper bounds to flood stages and magnitudes. Along most of its course Nahal Paran, a major tributary that impacts the morphology, floods and sediments of Nahal Arava at the study reach, is a coarse-gravel, braided ephemeral stream. Downstream of the Arava-Paran confluence, aeolian and fluvial sand delivered from eastern Arava valley alters the channel morphology. The sand has accreted up to 2.5 m above the distinct current channels, facilitating the recording of large floods. This sand enhances the establishment of denser riparian vegetation (mainly Taniarix nilotica and Haloxylon persicum) that interacts with floods and affects stream morphology. A temporal association was found between specific floods recorded upstream and tree-ring ages of re-growth of flood-damaged tamarix trees (’sigafoos trees’) in the past 30 years. This association can be utilized for developing a twentieth century flood chronology in hyperarid ungauged basins in the region. The minimum magnitude of the largest flood that covered the entire channel width, estimated from flood deposits, is approximately 1700-1800 m(3)s(-1). This is a larger magnitude than the largest gauged flood of 1150 m(3)s(-1) that occurred in 1970 about 30 km upstream in Nahal Paran. Our estimation agrees with flood magnitude estimated from the regional envelope curve of the largest floods. Based on Holocene alluvial stratigraphy and OSL dating in the study reach we also conclude that flood stages did not reach the late Holocene (similar to 2.2 ka) surface and therefore we estimate a non-exceedance upper bound of similar to 2000 m(3) s(-1) flood magnitudes for Nahal Arava during that interval. This study indicates that in unfavorable areas the combination of hydrology, fluvial morphology and botanic evidence can increase our understanding of ungauged basins and give information crucial for hydrology planning. (C) 2007 Elsevier B.V. All rights reserved. |
英文关键词 | Negev desert Arava valley flood paleofloods tree ring alluvial stratigraphy Arid |
类型 | Article |
语种 | 英语 |
国家 | Israel ; USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000254308000011 |
WOS关键词 | NEGEV DESERT ; SEDIMENTS ; ZIN ; PALEOFLOODS ; FREQUENCY ; CATCHMENT ; QUARTZ ; STORM ; UTAH |
WOS类目 | Geography, Physical ; Geosciences, Multidisciplinary |
WOS研究方向 | Physical Geography ; Geology |
来源机构 | Ben-Gurion University of the Negev ; Hebrew University of Jerusalem ; Desert Research Institute |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/157433 |
作者单位 | 1.Hebrew Univ Jerusalem, Inst Earth Sci, IL-91904 Jerusalem, Israel; 2.Hebrew Univ Jerusalem, Dept Geog, IL-91905 Jerusalem, Israel; 3.Geol Survey Israel, IL-95501 Jerusalem, Israel; 4.Desert Res Inst, Reno, NV 89512 USA; 5.Ben Gurion Univ Negev, Zuckerberg Inst Water Res, IL-84990 Sede Boqer, Israel |
推荐引用方式 GB/T 7714 | Jacoby, Yael,Grodek, Tamir,Enzel, Yehouda,et al. Late Holocene upper bounds of flood magnitudes and twentieth century large floods in the ungauged, hyperarid alluvial Nahal Arava, Israel[J]. Ben-Gurion University of the Negev, Hebrew University of Jerusalem, Desert Research Institute,2008,95(3-4):274-294. |
APA | Jacoby, Yael,Grodek, Tamir,Enzel, Yehouda,Porat, Naomi,McDonald, Eric V.,&Dahan, Ofer.(2008).Late Holocene upper bounds of flood magnitudes and twentieth century large floods in the ungauged, hyperarid alluvial Nahal Arava, Israel.GEOMORPHOLOGY,95(3-4),274-294. |
MLA | Jacoby, Yael,et al."Late Holocene upper bounds of flood magnitudes and twentieth century large floods in the ungauged, hyperarid alluvial Nahal Arava, Israel".GEOMORPHOLOGY 95.3-4(2008):274-294. |
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